Split pulley.



No. 774,965. PATENTED NOV. 15, 1904.

- H. A. DAVENPORT.

SPLIT PULLEY.

' APPLICATION FILED FEB. 27, 1904.

N0 MODEL.

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UNITED STATES Patented November 15, 1904.

PATENT OFFICE.

HERMAN A. DAVENPORT, OF BROCKTON, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TOLEONARD H. HAMEL, OF BEVERLY, MASSACHUSETTS.

SPLIT PULLEY.

SPECIFICATION forming part of Letters Patent No. 774,965, dated November15, 1904. Application filed February 27, 1904. Serial No. 195.552. (Nomodel.)

To all whom it may concern.-

Be it known that I, HERMAN A. DAVENPORT, of Brockton, in the county ofPlymouth and State of Massachusetts, have invented certain new anduseful Improvements in Split Pulleys, of which the following is aspecification.

This invention relates to pulleys of the sectional type designed to beapplied to shafting without disconnecting the latter or removing it fromits bearings.

As is well known, it is frequently desirable that a pulley shall beapplied to a shaft intermediate its ends, and many attempts have beenmade to provide a sectional pulley or roll.

which may be readily removed from the shaft which supports and drives itor which it drives and which may be reapplied thereto, either to enabledifferent rolls or pulleys to be used interchangeably with the sameshaft or so as to apply a pulley in aparticularlydesirable location.vPulleys of this type have been provided which require a splinedconnection with the shaft or an equivalent means for rotatably securingthe shaft and pulley.

The object of this invention is to provide a pulley of this character inwhich no clutch or rib or equivalent device is required, which pulleyshall be self-tightening upon the shaft by the simple endwise movementof the sections or members relatively to each other when said sectionsare being applied, a reverse endwise movement disconnecting the sectionsfrom the shaft.

To these ends the invention consists in the construction and combinationof parts, substantially as hereinafter described and claimed. 7

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a side elevation of apulley embodying my invention,the two members of the pulley being secured upon a shaft, the latterbeing represented in section. Fig. 2 represents a section on line 2 2 ofFig. 1 looking in the direction of the arrows. Fig. 3 represents asection on line 3 3 of Fig. l lookingin the direction of the arrows.Fig. 4 represents the hub portions of the two sections of the pulley inper I spective and detached from each other. Fig.

5 represents a detail section of the hub portion of the pulley on line 55 of Fig. 8. Fig. 6 represents a section similar to Fig. 5, but on theline 6 6 of Fig. 3. Fig. 7 is a detail perspective showing the hubportions of the pulley when the sections are partially secured 5 5together and to the shaft. 1

Similar reference characters indicate the same parts in all the figures.

The two sections of the pulley are represented as a whole at a and b.The said sections are formed, respectively, with semicylindricalshaft-seats a and 5, which are preferably formed of a diameter slightlyless than that of the shaft 0, to which the pulley is to be secured. Thesection a is formed with two radial faces a -that is, each face a is ina plane radial to the axis of the pulley and leads from the margin ofthe shaft-seat. The section 6 is provided with faces 6 which are alsoradial to the axis of the pulley and lead from 7 the opposite margins ofthe shaft-seat of said section.

In planes at one side of and parallel with the planes of the radialfaces a b the sections a and b are formed with faces a and Z2respectively, which are tangential to the axis of the pulley, and thesaid tangential and radial faces are connected by faces a and If of thesections a and b, respectively, the said connecting-faces cf and 6*being tapered endwise relatively to the axis of the pulley and beinglaterally inclined, so as to meet the inner radial faces a 5 and outertangential faces a b at acute angles, as will be readily apparent,particularly in Figs. 5 and 6.

It will now be understood that when the two sections or members of thepulley are placed against opposite sides of the shaft, but laterallydisplaced relatively to each other, so that the narrow ends of the ribswhich pro- 9 ject from the section 6 can be slipped into the recessesbetween the faces a and (4* of section a, a lateral movement of the twosections relatively to each other, so that the said ribs of the sectiona will move endwise of the hub portion of the section a,

will cause the two sections to bind firmly upon the shaft. This actionis due to the faces a" and 7)" being inclined both laterally andendwise, so that the relative endwise movement of the two sections afterplacing them upon the shaft will cause the two sections to closelyapproach each other and the shaft.

In order that the parts may be held so that they cannot by anypossibility slip endwise relatively to each other, 1 may employ alocking device, such as a screw 7), fittingin threaded half-socketsformed in two of the meeting faces a and If at one side of the shaft.

Preferably the internal diameter of the bore of the pulley formed by thetwo semicylindrical shaft-seats will be a trifle under the size of theshaft-as, for instance, five onethousandths of an inch. This not onlyallows for a practical clamping action,although there may be a slightvariation in the size of the shaft, but it also causes the edges ormargins of the shaft-seats to bite into the shaft as the two sectionsare strongly drawn toward each other. The biting edges of the twosections are of course diametrically opposite each other, and owing tothe fact that the faces a b are radial the said biting edges areangular, and therefore capable of forcing their way slightly into theperiphery of the shaft when the latter is a trifle larger in diameterthan the diameter of the pulley-bore as a whole.

It will be readily understood that if the pulley is to be applied to ashaft that is considerably smaller than the bore of the pulley a bushinge, such as represented by dotted lines in Fig. 6, may be first placedupon the shaft, said bushing being pinched or jammed or wedged betweenthe shaft and the semicylindrical seats of the pulley-sections.

While 1 have employed the terms radial and tangential, it is to beunderstood that these words are not to be construed in a limiting sense,for the reason that the faces a b and (0 5 might be in other than trueflat planes and still fall within the scope of my invention.

1 claim- 1. A split pulley having its sections each provided with apractically semicylindrical shaft-seat, two inner faces leading from themargins of the shaft-seat in planes radial to the axis of the pulley,two outer faces in planes tangential to said axis, and twoconnecting-faces in planes tapered endwise of said axis and meeting theinner and outer faces at acute angles, whereby when the sections aremoved longitudinally of the shaft the edges of the shaft-seats will biteinto said shaft.

2. A split pulley having its sections each provided with a practicallysemicylindrical shaft-seat, and with interlocking faces inclinedlaterally and endwise, the edges of the shaftseats being formed to biteor cut into the periphery of the shaft to which the pulley is to besecured when said sections are moved endwise relatively to said shaft.

3. A split pulley having its sections each provided with an exactlysemicylindrical shaft-seat, two inner faces leading from the margins ofthe shaft-seat in planes radial to the axis of the pulley, two outerfaces in planes tangential to said axis, and two connectingfaces inplanes tapered endwise of said axis and meeting the inner and outerfaces at acute angles, means being provided for preventing relativeendwise movement of the sections after they have been secured to theshaft, whereby when the sections are moved longitudinally of the shaftthe edges of the shaftseats will bite into said shaft.

In testimony whereof I have affixed my signature in presence of twowitnesses.

HERMAN A. DAVENPORT.

WVitnesses:

A. 'W. HARRIsoN, R. M. PInRsoN.

